The 49mm Fork Adjusters are manufactured for speed and beauty.CNC machined out of 6061 aluminum with precise craftsmanship, engineering and balance.With up to 7/8″ adjustment, these fork caps will replace your stock ones and allow you to fine tune your front suspension. With a turn of the adjuster, up or down, you can dial in your front-end preload without having to remove the stock caps and cutting spacers. Comes with o-rings and ready to install